
// tutorial05.c
// A pedagogical video player that really works!
//
// Code based on FFplay, Copyright (c) 2003 Fabrice Bellard, 
// and a tutorial by Martin Bohme (boehme@inb.uni-luebeckREMOVETHIS.de)
// Tested on Gentoo, CVS version 5/01/07 compiled with GCC 4.1.1
// Use
//
// gcc -o tutorial05 tutorial05.c -lavformat -lavcodec -lz -lm `sdl-config --cflags --libs`
// to build (assuming libavformat and libavcodec are correctly installed, 
// and assuming you have sdl-config. Please refer to SDL docs for your installation.)
//
// Run using
// tutorial05 myvideofile.mpg
//
// to play the video.

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>

#include <SDL.h>
#include <SDL_thread.h>

#ifdef __MINGW32__
#undef main /* Prevents SDL from overriding main() */
#endif

#include <stdio.h>
#include <math.h>

#define SDL_AUDIO_BUFFER_SIZE 1024

#define MAX_AUDIOQ_SIZE (5 * 16 * 1024)
#define MAX_VIDEOQ_SIZE (5 * 256 * 1024)

#define AV_SYNC_THRESHOLD 0.01
#define AV_NOSYNC_THRESHOLD 10.0

#define FF_ALLOC_EVENT   (SDL_USEREVENT)
#define FF_REFRESH_EVENT (SDL_USEREVENT + 1)
#define FF_QUIT_EVENT (SDL_USEREVENT + 2)

#define VIDEO_PICTURE_QUEUE_SIZE 1

typedef struct PacketQueue {
	AVPacketList *first_pkt, *last_pkt;
	int nb_packets;
	int size;
	SDL_mutex *mutex;
	SDL_cond *cond;
} PacketQueue;


typedef struct VideoPicture {
	SDL_Overlay *bmp;
	int width, height; /* source height & width */
	int allocated;
	double pts;
} VideoPicture;

typedef struct VideoState {
	char		vidFlag;
	char		audFlag;

	AVFormatContext *pFormatCtx;
	int             videoStream, audioStream;

	double          audio_clock;
	AVStream        *audio_st;
	PacketQueue     audioq;
	uint8_t         audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2];
	unsigned int    audio_buf_size;
	unsigned int    audio_buf_index;
	AVPacket        audio_pkt;
	uint8_t         *audio_pkt_data;
	int             audio_pkt_size;
	int             audio_hw_buf_size;  
	double          frame_timer;
	double          frame_last_pts;
	double          frame_last_delay;
	double          video_clock; ///<pts of last decoded frame / predicted pts of next decoded frame
	AVStream        *video_st;
	PacketQueue     videoq;

	SDL_Thread      *parse_tid;
	SDL_Thread      *video_tid;

	VideoPicture *    pictq; // all these are now pointers to the MIXER items
	int 		*pictq_size, *pictq_rindex, *pictq_windex;
	SDL_mutex        *pictq_mutex;
	SDL_cond         *pictq_cond;

	char            filename[1024];
	int *           quit;
} VideoState;

typedef struct Mixer {
	VideoState ** array;
	int numVids;
	int quitAll; /* DEBUG - have we used it ? */
	int audioSync; //this is the array[i] that is synced and played now
	int videoSync;
	
	VideoPicture    pictq[VIDEO_PICTURE_QUEUE_SIZE]; //these are the real items. the videoState now holds pointer to these
	int             pictq_size, pictq_rindex, pictq_windex;
	SDL_mutex       *pictq_mutex;
	SDL_cond        *pictq_cond;
} Mixer;

SDL_Surface     *screen;

/* Since we only have one decoding thread, the Big Struct
	   can be global in case we need it. */

// VideoState *global_video_state; 
Mixer * mixer; //global mixer
/*
		this is Netzer's replacement func for img_convert using swScale

 */
void img_convert(AVPicture * target , int targetFmt, AVPicture * source ,int sourceFmt,int w, int h)
{
	static struct SwsContext *img_convert_ctx=NULL;
	if(img_convert_ctx == NULL)
	{
		img_convert_ctx = sws_getContext(w, h,
				sourceFmt, w, h, targetFmt, SWS_BICUBIC,NULL, NULL, NULL);
	}
	sws_scale(img_convert_ctx, source->data,
			source->linesize, 0,
			h, target->data, target->linesize);
}


void packet_queue_init(PacketQueue *q) {
	memset(q, 0, sizeof(PacketQueue));
	q->mutex = SDL_CreateMutex();
	q->cond = SDL_CreateCond();
}
int packet_queue_put(PacketQueue *q, AVPacket *pkt) {

	AVPacketList *pkt1;
	if(av_dup_packet(pkt) < 0) {
		return -1;
	}
	pkt1 = av_malloc(sizeof(AVPacketList));
	if (!pkt1)
		return -1;
	pkt1->pkt = *pkt;
	pkt1->next = NULL;

	SDL_LockMutex(q->mutex);

	if (!q->last_pkt)
		q->first_pkt = pkt1;
		else
			q->last_pkt->next = pkt1;
			q->last_pkt = pkt1;
			q->nb_packets++;
			q->size += pkt1->pkt.size;
			SDL_CondSignal(q->cond);

			SDL_UnlockMutex(q->mutex);
			return 0;
}
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block)
{
	AVPacketList *pkt1;
	int ret;

	SDL_LockMutex(q->mutex);

	for(;;) {

		if(mixer->quitAll) {
			ret = -1;
			break;
		}

		pkt1 = q->first_pkt;
		if (pkt1) {
			q->first_pkt = pkt1->next;
			if (!q->first_pkt)
				q->last_pkt = NULL;
				q->nb_packets--;
				q->size -= pkt1->pkt.size;
				*pkt = pkt1->pkt;
				av_free(pkt1);
				ret = 1;
				break;
		} else if (!block) {
			ret = 0;
			break;
		} else {
			SDL_CondWait(q->cond, q->mutex);
		}
	}
	SDL_UnlockMutex(q->mutex);
	return ret;
}
double get_audio_clock(Mixer *is) {
	double pts;
	int hw_buf_size, bytes_per_sec, n;

	pts = is->array[is->videoSync]->audio_clock; /* maintained in the audio thread */
	hw_buf_size = is->array[is->videoSync]->audio_buf_size - is->array[is->videoSync]->audio_buf_index;
	bytes_per_sec = 0;
	n = is->array[is->videoSync]->audio_st->codec->channels * 2;
	if(is->array[is->videoSync]->audio_st) {
		bytes_per_sec = is->array[is->videoSync]->audio_st->codec->sample_rate * n;
	}
	if(bytes_per_sec) {
		pts -= (double)hw_buf_size / bytes_per_sec;
	}
	return pts;
}

int audio_decode_frame(VideoState *is, uint8_t *audio_buf, int buf_size, double *pts_ptr) {

	int len1, data_size, n;
	AVPacket *pkt = &is->audio_pkt;
	double pts;

	for(;;) {
		while(is->audio_pkt_size > 0) {
			data_size = buf_size;
			len1 = avcodec_decode_audio2(is->audio_st->codec, 
					(int16_t *)audio_buf, &data_size, 
					is->audio_pkt_data, is->audio_pkt_size);
			if(len1 < 0) {
				/* if error, skip frame */
				is->audio_pkt_size = 0;
				break;
			}
			is->audio_pkt_data += len1;
			is->audio_pkt_size -= len1;
			if(data_size <= 0) {
				/* No data yet, get more frames */
				continue;
			}
			pts = is->audio_clock;
			*pts_ptr = pts;
			n = 2 * is->audio_st->codec->channels;
			is->audio_clock += (double)data_size /
			(double)(n * is->audio_st->codec->sample_rate);

			/* We have data, return it and come back for more later */
			return data_size;
		}
		if(pkt->data)
			av_free_packet(pkt);

		if(*(is->quit)) {
			return -1;
		}
		/* next packet */
		if(packet_queue_get(&is->audioq, pkt, 1) < 0) {
			return -1;
		}
		is->audio_pkt_data = pkt->data;
		is->audio_pkt_size = pkt->size;
		/* if update, update the audio clock w/pts */
		if(pkt->pts != AV_NOPTS_VALUE) {
			is->audio_clock = av_q2d(is->audio_st->time_base)*pkt->pts;
		}

	}
}

void audio_callback(void *userdata, Uint8 *stream, int len) {

	VideoState *is = (VideoState *)userdata;
	int len1, audio_size;
	double pts;

	while(len > 0) {
		if(is->audio_buf_index >= is->audio_buf_size) {
			/* We have already sent all our data; get more */
			audio_size = audio_decode_frame(is, is->audio_buf, sizeof(is->audio_buf), &pts);
			if(audio_size < 0) {
				/* If error, output silence */
				is->audio_buf_size = 1024;
				memset(is->audio_buf, 0, is->audio_buf_size);
			} else {
				is->audio_buf_size = audio_size;
			}
			is->audio_buf_index = 0;
		}
		len1 = is->audio_buf_size - is->audio_buf_index;
		if(len1 > len)
			len1 = len;
		memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);
		len -= len1;
		stream += len1;
		is->audio_buf_index += len1;
	}
}

static Uint32 sdl_refresh_timer_cb(Uint32 interval, void *opaque) {
	SDL_Event event;
	event.type = FF_REFRESH_EVENT;
	event.user.data1 = opaque;
	SDL_PushEvent(&event);
	return 0; /* 0 means stop timer */
}

/* schedule a video refresh in 'delay' ms */
static void schedule_refresh(Mixer *is, int delay) {
	SDL_AddTimer(delay, sdl_refresh_timer_cb, is);
}

void video_display(VideoState *is) {

	SDL_Rect rect;
	VideoPicture *vp;
	AVPicture pict;
	float aspect_ratio;
	int w, h, x, y;
	int i;

	vp = &is->pictq[*(is->pictq_rindex)];
	if(vp->bmp) {
		if(is->video_st->codec->sample_aspect_ratio.num == 0) {
			aspect_ratio = 0;
		} else {
			aspect_ratio = av_q2d(is->video_st->codec->sample_aspect_ratio) *
			is->video_st->codec->width / is->video_st->codec->height;
		}
		if(aspect_ratio <= 0.0) {
			aspect_ratio = (float)is->video_st->codec->width /
			(float)is->video_st->codec->height;
		}
		h = screen->h;
		w = ((int)rint(h * aspect_ratio)) & -3;
		if(w > screen->w) {
			w = screen->w;
			h = ((int)rint(w / aspect_ratio)) & -3;
		}
		x = (screen->w - w) / 2;
		y = (screen->h - h) / 2;

		rect.x = x;
		rect.y = y;
		rect.w = w;
		rect.h = h;
		SDL_DisplayYUVOverlay(vp->bmp, &rect);
	}
}

void video_refresh_timer(void *userdata) {

	Mixer *is = (Mixer *)userdata;
	VideoPicture *vp;
	double actual_delay, delay, sync_threshold, ref_clock, diff;

	if(is->array[is->videoSync]->video_st) {
		if(is->pictq_size == 0) {
			schedule_refresh(is, 1);
		} else {
			vp = &(is->pictq[is->pictq_rindex]);

			delay = vp->pts - is->array[is->videoSync]->frame_last_pts; /* the pts from last time */
			if(delay <= 0 || delay >= 1.0) {
				/* if incorrect delay, use previous one */
				delay = is->array[is->videoSync]->frame_last_delay;
			}
			/* save for next time */
			is->array[is->videoSync]->frame_last_delay = delay;
			is->array[is->videoSync]->frame_last_pts = vp->pts;

			/* update delay to sync to audio */
			ref_clock = get_audio_clock(is);
			diff = vp->pts - ref_clock;

			/* Skip or repeat the frame. Take delay into account
		 FFPlay still doesn't "know if this is the best guess." */
			sync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay : AV_SYNC_THRESHOLD;
			if(fabs(diff) < AV_NOSYNC_THRESHOLD) {
				if(diff <= -sync_threshold) {
					delay = 0;
				} else if(diff >= sync_threshold) {
					delay = 2 * delay;
				}
			}
			is->array[is->videoSync]->frame_timer += delay;
			/* computer the REAL delay */
			actual_delay = is->array[is->videoSync]->frame_timer - (av_gettime() / 1000000.0);
			if(actual_delay < 0.010) {
				/* Really it should skip the picture instead */
				actual_delay = 0.010;
			}
			schedule_refresh(is, (int)(actual_delay * 1000 + 0.5));
			/* show the picture! */
			video_display(is->array[is->videoSync]);

			/* update queue for next picture! */
			if(++(is->pictq_rindex) == VIDEO_PICTURE_QUEUE_SIZE) {
				is->pictq_rindex = 0;
			}
			SDL_LockMutex(is->pictq_mutex);
			(is->pictq_size)--;
			SDL_CondSignal(is->pictq_cond);
			SDL_UnlockMutex(is->pictq_mutex);
		}
	} else {
		schedule_refresh(is, 100);
	}
}

void alloc_picture(void *userdata) {

	VideoState *is = (VideoState *)userdata;
	VideoPicture *vp;

	vp = &is->pictq[*(is->pictq_windex)];
	if(vp->bmp) {
		// we already have one make another, bigger/smaller
		SDL_FreeYUVOverlay(vp->bmp);
	}
	// Allocate a place to put our YUV image on that screen
	vp->bmp = SDL_CreateYUVOverlay(is->video_st->codec->width,
			is->video_st->codec->height,
			SDL_YV12_OVERLAY,
			screen);
	vp->width = is->video_st->codec->width;
	vp->height = is->video_st->codec->height;

	SDL_LockMutex(is->pictq_mutex);
	vp->allocated = 1;
	SDL_CondSignal(is->pictq_cond);
	SDL_UnlockMutex(is->pictq_mutex);

}

int queue_picture(VideoState *is, AVFrame *pFrame, double pts) {

	VideoPicture *vp;
	int dst_pix_fmt;
	AVPicture pict;

	/* wait until we have space for a new pic */
	SDL_LockMutex(is->pictq_mutex);
	while(*(is->pictq_size) >= VIDEO_PICTURE_QUEUE_SIZE &&
			!*(is->quit)) {
		SDL_CondWait(is->pictq_cond, is->pictq_mutex);
	}
	SDL_UnlockMutex(is->pictq_mutex);

	if(*(is->quit))
		return -1;

	// windex is set to 0 initially
	vp = &is->pictq[*(is->pictq_windex)];

	/* allocate or resize the buffer! */
	if(!vp->bmp ||
			vp->width != is->video_st->codec->width ||
			vp->height != is->video_st->codec->height) {
		SDL_Event event;

		vp->allocated = 0;
		/* we have to do it in the main thread */
		event.type = FF_ALLOC_EVENT;
		event.user.data1 = is;
		SDL_PushEvent(&event);

		/* wait until we have a picture allocated */
		SDL_LockMutex(is->pictq_mutex);
		while(!vp->allocated && !*(is->quit)) {
			SDL_CondWait(is->pictq_cond, is->pictq_mutex);
		}
		SDL_UnlockMutex(is->pictq_mutex);
		if(*(is->quit)) {
			return -1;
		}
	}
	/* We have a place to put our picture on the queue */
	/* If we are skipping a frame, do we set this to null 
	     but still return vp->allocated = 1? */


	if(vp->bmp) {

		SDL_LockYUVOverlay(vp->bmp);

		dst_pix_fmt = PIX_FMT_YUV420P;
		/* point pict at the queue */

		pict.data[0] = vp->bmp->pixels[0];
		pict.data[1] = vp->bmp->pixels[2];
		pict.data[2] = vp->bmp->pixels[1];

		pict.linesize[0] = vp->bmp->pitches[0];
		pict.linesize[1] = vp->bmp->pitches[2];
		pict.linesize[2] = vp->bmp->pitches[1];

		// Convert the image into YUV format that SDL uses
		img_convert(&pict, dst_pix_fmt,
				(AVPicture *)pFrame, is->video_st->codec->pix_fmt, 
				is->video_st->codec->width, is->video_st->codec->height);

		SDL_UnlockYUVOverlay(vp->bmp);
		vp->pts = pts;

		/* now we inform our display thread that we have a pic ready */
		if (++(*(is->pictq_windex)) == VIDEO_PICTURE_QUEUE_SIZE) {
			*(is->pictq_windex) = 0;
		}
		SDL_LockMutex(is->pictq_mutex);
		(*(is->pictq_size))++;
		SDL_UnlockMutex(is->pictq_mutex);
	}
	return 0;
}

double synchronize_video(VideoState *is, AVFrame *src_frame, double pts) {

	double frame_delay;

	if(pts != 0) {
		/* if we have pts, set video clock to it */
		is->video_clock = pts;
	} else {
		/* if we aren't given a pts, set it to the clock */
		pts = is->video_clock;
	}
	/* update the video clock */
	frame_delay = av_q2d(is->video_st->codec->time_base);
	/* if we are repeating a frame, adjust clock accordingly */
	frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);
	is->video_clock += frame_delay;
	return pts;
}
uint64_t global_video_pkt_pts = AV_NOPTS_VALUE;

/* These are called whenever we allocate a frame
 * buffer. We use this to store the global_pts in
 * a frame at the time it is allocated.
 */
int our_get_buffer(struct AVCodecContext *c, AVFrame *pic) {
	int ret = avcodec_default_get_buffer(c, pic);
	uint64_t *pts = av_malloc(sizeof(uint64_t));
	*pts = global_video_pkt_pts;
	pic->opaque = pts;
	return ret;
}
void our_release_buffer(struct AVCodecContext *c, AVFrame *pic) {
	if(pic) av_freep(&pic->opaque);
	avcodec_default_release_buffer(c, pic);
}

int video_thread(void *arg) {
	VideoState *is = (VideoState *)arg;
	AVPacket pkt1, *packet = &pkt1;
	int len1, frameFinished;
	AVFrame *pFrame;
	double pts;

	pFrame = avcodec_alloc_frame();

	for(;;) {
		if(packet_queue_get(&is->videoq, packet, 1) < 0) {
			// means we quit getting packets
			break;
		}
		pts = 0;

		// Save global pts to be stored in pFrame in first call
		global_video_pkt_pts = packet->pts;
		// Decode video frame
		len1 = avcodec_decode_video(is->video_st->codec, pFrame, &frameFinished, 
				packet->data, packet->size);
		if(packet->dts == AV_NOPTS_VALUE 
				&& pFrame->opaque && *(uint64_t*)pFrame->opaque != AV_NOPTS_VALUE) {
			pts = *(uint64_t *)pFrame->opaque;
		} else if(packet->dts != AV_NOPTS_VALUE) {
			pts = packet->dts;
		} else {
			pts = 0;
		}
		pts *= av_q2d(is->video_st->time_base);

		// Did we get a video frame?
		if(frameFinished) {
			pts = synchronize_video(is, pFrame, pts);
			if(queue_picture(is, pFrame, pts) < 0) {
				break;
			}
		}
		av_free_packet(packet);
	}
	av_free(pFrame);
	return 0;
}

int stream_component_open(VideoState *is, int stream_index) {

	AVFormatContext *pFormatCtx = is->pFormatCtx;
	AVCodecContext *codecCtx;
	AVCodec *codec;
	SDL_AudioSpec wanted_spec, spec;

	if(stream_index < 0 || stream_index >= pFormatCtx->nb_streams) {
		return -1;
	}

	// Get a pointer to the codec context for the video stream
	codecCtx = pFormatCtx->streams[stream_index]->codec;
/*
	if(codecCtx->codec_type == CODEC_TYPE_AUDIO) {
		// Set audio settings from codec info
		wanted_spec.freq = codecCtx->sample_rate;
		wanted_spec.format = AUDIO_S16SYS;
		wanted_spec.channels = codecCtx->channels;
		wanted_spec.silence = 0;
		wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
		wanted_spec.callback = audio_callback;
		wanted_spec.userdata = is;

		if(SDL_OpenAudio(&wanted_spec, &spec) < 0) {
			fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
			return -1;
		}
		is->audio_hw_buf_size = spec.size;
	*/
	}
	codec = avcodec_find_decoder(codecCtx->codec_id);

	if(!codec || (avcodec_open(codecCtx, codec) < 0)) {
		fprintf(stderr, "Unsupported codec!\n");
		return -1;
	}

	switch(codecCtx->codec_type) {
	case CODEC_TYPE_AUDIO:
		is->audioStream = stream_index;
		is->audio_st = pFormatCtx->streams[stream_index];
		is->audio_buf_size = 0;
		is->audio_buf_index = 0;
		memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
		packet_queue_init(&is->audioq);
	/*	SDL_PauseAudio(0); */
		break;
	case CODEC_TYPE_VIDEO:
		is->videoStream = stream_index;
		is->video_st = pFormatCtx->streams[stream_index];

		is->frame_timer = (double)av_gettime() / 1000000.0;
		is->frame_last_delay = 40e-3;

		packet_queue_init(&is->videoq);
	/*	is->video_tid = SDL_CreateThread(video_thread, is); */
		codecCtx->get_buffer = our_get_buffer;
		codecCtx->release_buffer = our_release_buffer;
		break;
	default:
		break;
	}


}
// HELP // sould we change ? yes..
/*
int decode_interrupt_cb(void) {
	return (global_video_state && *(global_video_state->quit));
}
*/

int decode_thread(void *arg) {

	VideoState *is = (VideoState *)arg;
	AVFormatContext *pFormatCtx;
	AVPacket pkt1, *packet = &pkt1;

	int video_index = -1;
	int audio_index = -1;
	int i;

	is->videoStream=-1;
	is->audioStream=-1;

	//global_video_state = is;
	// will interrupt blocking functions if we quit!
	//url_set_interrupt_cb(decode_interrupt_cb); // HELP what does this do ? should we delete - yes- only check "quitAll"

	// Open video file
	if(av_open_input_file(&pFormatCtx, is->filename, NULL, 0, NULL)!=0)
		return -1; // Couldn't open file

	is->pFormatCtx = pFormatCtx;

	// Retrieve stream information
	if(av_find_stream_info(pFormatCtx)<0)
		return -1; // Couldn't find stream information

	// Dump information about file onto standard error
	dump_format(pFormatCtx, 0, is->filename, 0);

	// Find the first video stream

	for(i=0; i<pFormatCtx->nb_streams; i++) {
		if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO &&
				video_index < 0) {
			video_index=i;
		}
		if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_AUDIO &&
				audio_index < 0) {
			audio_index=i;
		}
	}

	if(audio_index >= 0) {
		stream_component_open(is, audio_index);
	}
	if(video_index >= 0) {
		stream_component_open(is, video_index);
	} 

	if(is->videoStream < 0 || is->audioStream < 0) {
		fprintf(stderr, "%s: could not open codecs\n", is->filename);
		goto fail;
	}

	// main decode loop

	for(;;) {
		if(*(is->quit)) {
			break;
		}
		// seek stuff goes here
		if(is->audioq.size > MAX_AUDIOQ_SIZE ||
				is->videoq.size > MAX_VIDEOQ_SIZE) {
			SDL_Delay(10);
			continue;
		}
		if(av_read_frame(is->pFormatCtx, packet) < 0) {
			if(url_ferror(&pFormatCtx->pb) == 0) {
				SDL_Delay(100); /* no error; wait for user input */
				continue;
			} else {
				break;
			}
		}
		// Is this a packet from the video stream?
		if(packet->stream_index == is->videoStream) {
			packet_queue_put(&is->videoq, packet);
		} else if(packet->stream_index == is->audioStream) {
			packet_queue_put(&is->audioq, packet);
		} else {
			av_free_packet(packet);
		}
	}
	/* all done - wait for it */
	while(!*(is->quit)) {
		SDL_Delay(100);
	}

	fail:
	{
		SDL_Event event;
		event.type = FF_QUIT_EVENT;
		event.user.data1 = is;
		SDL_PushEvent(&event);
	}
	return 0;
}



int output_open(VideoState *is, int stream_index) {

	AVFormatContext *pFormatCtx = is->pFormatCtx;
	AVCodecContext *codecCtx;
	AVCodec *codec;
	SDL_AudioSpec wanted_spec, spec;

	if(stream_index < 0 || stream_index >= pFormatCtx->nb_streams) {
		return -1;
	}

	// Get a pointer to the codec context for the video stream
	codecCtx = pFormatCtx->streams[stream_index]->codec;

	if(codecCtx->codec_type == CODEC_TYPE_AUDIO) {
		// Set audio settings from codec info
		wanted_spec.freq = codecCtx->sample_rate;
		wanted_spec.format = AUDIO_S16SYS;
		wanted_spec.channels = codecCtx->channels;
		wanted_spec.silence = 0;
		wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
		wanted_spec.callback = audio_callback;
		wanted_spec.userdata = is;

		if(SDL_OpenAudio(&wanted_spec, &spec) < 0) {
			fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
			return -1;
		}
		mixer->audio_hw_buf_size = spec.size; // DEBUG: this is GLOBAL CALL
	
	}

	SDL_PauseAudio(0);
	mixer->video_tid = SDL_CreateThread(video_thread, mixer); // DEBUG: this is GLOBAL CALL



}






void mixer_free(Mixer * mixer){
	int j=0;

	for (j = 0; j < mixer->numVids; j++){
		av_free(mixer->array[j]);
	}

	free(mixer->array);

	SDL_DestroyMutex(mixer->pictq_mutex);
	SDL_DestroyCond(mixer->pictq_cond);

}


int mixerInit(Mixer *mixer, int num, char ** argv){
	int i, j;
	SDL_Thread * temp_parse_tid = NULL;

	mixer->numVids = num;
	mixer->quitAll = 0;

	// Register all formats and codecs
	av_register_all();


	if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
		fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
		return 0;
	}

	// Make a screen to put our video
	#ifndef __DARWIN__
	screen = SDL_SetVideoMode(640, 480, 0, 0);
	#else
		screen = SDL_SetVideoMode(640, 480, 24, 0);
	#endif
	if(!screen) {
		fprintf(stderr, "SDL: could not set video mode - exiting\n");
		return 0;
	}


	//alloc array of pointers to video states
	mixer->array = (VideoState **) malloc(num*(sizeof(VideoState *)));
	if (mixer->array == NULL) return 0;

	mixer->pictq_mutex = SDL_CreateMutex();
	mixer->pictq_cond = SDL_CreateCond();

	//alloc and open each videostate
	for (i = 0; i < num; i++){
		mixer->array[i] = (VideoState *) av_mallocz(sizeof(VideoState));
		if (mixer->array[i] == NULL){
			for (j = i; j >= 0; j--){
				av_free(mixer->array[j]);
			}
			free(mixer->array);
			SDL_DestroyMutex(mixer->pictq_mutex);
			SDL_DestroyCond(mixer->pictq_cond);
			return 0;
		}
		strncat(mixer->array[i]->filename, argv[i+1], sizeof(mixer->array[i]->filename));
		mixer->array[i]->quit = &(mixer->quitAll); //this links all the "quit"s to a single quitAll
	}

	schedule_refresh(mixer, 40);



	for (i=0;i<num;i++){
		mixer->array[i]->parse_tid = SDL_CreateThread(decode_thread, mixer->array[i]);
		if(!mixer->array[i]->parse_tid) {
			mixer_free(mixer);
			return 0;
		}
		mixer->array[i]->pictq = mixer->pictq;
		mixer->array[i]->pictq_size = &(mixer->pictq_size);
		mixer->array[i]->pictq_rindex = &(mixer->pictq_rindex);
		mixer->array[i]->pictq_windex = &(mixer->pictq_windex);
		mixer->array[i]->pictq_mutex = mixer->pictq_mutex;
		mixer->array[i]->pictq_cond = mixer->pictq_cond;
	}

	
	return 1;
}






int main(int argc, char *argv[]) {

	SDL_Event       event;
	
	if(argc < 2) {
		fprintf(stderr, "Usage: test <file> <file>...\n");
		exit(1);
	}

	if (mixerInit(mixer, argc-1, argv) == 0){
		exit(1); //mixer init prints error msgs
	}

	for(;;) {
		SDL_WaitEvent(&event);
		switch(event.type) {
		case FF_QUIT_EVENT:
		case SDL_QUIT:
			mixer->quitAll = 1;
			SDL_Quit();
			exit(0);
			break;
		case FF_ALLOC_EVENT:
			alloc_picture(event.user.data1);
			break;
		case FF_REFRESH_EVENT:
			video_refresh_timer(event.user.data1);
			break;
		default:
			break;
		}
	}
	return 0;

}


